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O(2), pH, and Redox Potential Microprofiles around Potamogeton malaianus Measured Using Microsensors

This study aimed to elucidate the effects of periphyton on the microprofiles of oxygen (O(2)), pH, and oxidation-reduction potential around the stems and leaves of a submerged macrophyte Potamogeton malaianus and on the plant growth in the eutrophic shallow Taihu Lake, China. The microprofiles were...

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Autores principales: Dong, Bin, Han, Ruiming, Wang, Guoxiang, Cao, Xun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4086961/
https://www.ncbi.nlm.nih.gov/pubmed/25004129
http://dx.doi.org/10.1371/journal.pone.0101825
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author Dong, Bin
Han, Ruiming
Wang, Guoxiang
Cao, Xun
author_facet Dong, Bin
Han, Ruiming
Wang, Guoxiang
Cao, Xun
author_sort Dong, Bin
collection PubMed
description This study aimed to elucidate the effects of periphyton on the microprofiles of oxygen (O(2)), pH, and oxidation-reduction potential around the stems and leaves of a submerged macrophyte Potamogeton malaianus and on the plant growth in the eutrophic shallow Taihu Lake, China. The microprofiles were measured using a motorized microprofiling system equipped with microsensors. The leaf age of the macrophyte and periphyton exerted significant effects on the microprofiles of O(2), pH, and oxidation-reduction potential. O(2) concentration and pH increased whereas the oxidation-reduction potential decreased with decreasing distance to the stem/leaf surface. The fluctuation amplitudes of O(2), pH, and oxidation-reduction potential were the largest in the microprofiles of mature leaves and the lowest in senescent leaves. The periphyton increased the thickness of the broad diffusive boundary layer and fluctuation amplitudes of O(2), pH, and oxidation-reduction potential. When the periphyton was removed, the thickness of the broad diffusive boundary layer in the microprofiles of stems, senescent leaves, and mature leaves reduced by 29.0%, 49.72%, and 70.34%, and the O(2), pH, and oxidation-reduction potential fluctuation amplitudes also declined accordingly. Our results suggest that a thick periphyton exerted negative effects on the growth of macrophytes by providing extensive shading and creating a barrier that hindered the transport of dissolved substances such as O(2), and led to premature decline in macrophytes in the eutrophic Taihu Lake. The consequent implications can help to elucidate the control mechanism of the broad diffusive boundary layer around macrophytes on nutrient cycling in eutrophic waters and to better understand the role of this layer in the Taihu Lake and other similar eutrophic waters.
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spelling pubmed-40869612014-07-14 O(2), pH, and Redox Potential Microprofiles around Potamogeton malaianus Measured Using Microsensors Dong, Bin Han, Ruiming Wang, Guoxiang Cao, Xun PLoS One Research Article This study aimed to elucidate the effects of periphyton on the microprofiles of oxygen (O(2)), pH, and oxidation-reduction potential around the stems and leaves of a submerged macrophyte Potamogeton malaianus and on the plant growth in the eutrophic shallow Taihu Lake, China. The microprofiles were measured using a motorized microprofiling system equipped with microsensors. The leaf age of the macrophyte and periphyton exerted significant effects on the microprofiles of O(2), pH, and oxidation-reduction potential. O(2) concentration and pH increased whereas the oxidation-reduction potential decreased with decreasing distance to the stem/leaf surface. The fluctuation amplitudes of O(2), pH, and oxidation-reduction potential were the largest in the microprofiles of mature leaves and the lowest in senescent leaves. The periphyton increased the thickness of the broad diffusive boundary layer and fluctuation amplitudes of O(2), pH, and oxidation-reduction potential. When the periphyton was removed, the thickness of the broad diffusive boundary layer in the microprofiles of stems, senescent leaves, and mature leaves reduced by 29.0%, 49.72%, and 70.34%, and the O(2), pH, and oxidation-reduction potential fluctuation amplitudes also declined accordingly. Our results suggest that a thick periphyton exerted negative effects on the growth of macrophytes by providing extensive shading and creating a barrier that hindered the transport of dissolved substances such as O(2), and led to premature decline in macrophytes in the eutrophic Taihu Lake. The consequent implications can help to elucidate the control mechanism of the broad diffusive boundary layer around macrophytes on nutrient cycling in eutrophic waters and to better understand the role of this layer in the Taihu Lake and other similar eutrophic waters. Public Library of Science 2014-07-08 /pmc/articles/PMC4086961/ /pubmed/25004129 http://dx.doi.org/10.1371/journal.pone.0101825 Text en © 2014 Dong et al http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Dong, Bin
Han, Ruiming
Wang, Guoxiang
Cao, Xun
O(2), pH, and Redox Potential Microprofiles around Potamogeton malaianus Measured Using Microsensors
title O(2), pH, and Redox Potential Microprofiles around Potamogeton malaianus Measured Using Microsensors
title_full O(2), pH, and Redox Potential Microprofiles around Potamogeton malaianus Measured Using Microsensors
title_fullStr O(2), pH, and Redox Potential Microprofiles around Potamogeton malaianus Measured Using Microsensors
title_full_unstemmed O(2), pH, and Redox Potential Microprofiles around Potamogeton malaianus Measured Using Microsensors
title_short O(2), pH, and Redox Potential Microprofiles around Potamogeton malaianus Measured Using Microsensors
title_sort o(2), ph, and redox potential microprofiles around potamogeton malaianus measured using microsensors
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4086961/
https://www.ncbi.nlm.nih.gov/pubmed/25004129
http://dx.doi.org/10.1371/journal.pone.0101825
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